University is crushing me

I am writing this in hopes of providing those going through the same thing with consolation, as well as to make myself feel a bit better. 

I am in my first year of university, and as part of my studies, there are many classes I have to take, such as psychology, linguistics, statistics, etc. 

Turns out, I am TERRIBLE at statistics!!! 
All of the rules that you need to memorise, and even when I think I get them down correctly, I still get something wrong!

I have been so confident in myself this semester, only to receive mediocre grades.
I have already accidentally missed a test, which has never happened in my life!

I am so tired of trying and trying to the point where I am struggling to keep up with basic, even important deadlines. 
I always feel so dead and exhausted, even when I do not do anything.
I am trying to find another job that will help lift some weight off of my schedule, but the job market in my country is crumbling to pieces, and nobody seems to actually want to hire people with experience!

And I get it, university is hard. Mediocre grades are okay. But as part of my degree, I at least need a minimum of a B+ to be considered to go into my second year. 

I have no idea how to live right now. I am losing so much hair, my skin quality is so bad, and I feel so...ew.